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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '483dc891d3fa93a28c23f868311a9ad14d6945a3e495f5c5dd86548275e0fce4' 
  AND token = 'Yj1ydXrqAxK+U8a6EWNdMk+F+ic0rLgFgXmiaG+ymJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}